ls is taking long time to list

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http://www.unix.com – Hi, All the data are kept on Netapp using NFS. some directories are so fast when doing ls but few of them are slow. After doing few times, it becomes fast. Then again after few minutes, it becomes slow again. Can you advise what's going on? This one directory I am very interested is giving lot of issues. Here is little more about the directory. Code: /home/portal/htdocs/chip  ( inside this directory has many symbolic links) All of them lives on the Netapp. Thanks. (HowTos)